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Paper: Chapter 47: Introduction to DAL: Simple Image Access Protocol
Volume: 382, The National Virtual Observatory: Tools and Techniques for Astronomical Research
Page: 501
Authors: Kwok, S.-H.; Tody, D.
Abstract: The Simple Image Access Protocol (SIAP) is a standard VO protocol for retrieving astronomical images from online archives using a web interface. A major objective of the Simple Image Access Protocol is to unify various methods to access online image repositories into a single interface that is reasonably simple for curators to implement, and at the same time flexible enough for scientists to obtain the desired images without intimate knowledge of the repositories. In practice, this means that a single SIAP software library can be used to access many SIAP services, greatly reducing the need for customized software. Similarly, the SIAP standard enables astronomical image data curators to reach a larger numbers of users without the need to provide them with new software or documentation.

Since the release of version 1.0 of the SIAP specification, more than one hundred SIAP services have been registered with the NVO Registry. They provide images from the radio to infrared, optical, ultraviolet and X-ray wavebands, and from many different instruments and surveys. These SIAP services offer various degrees of capability, from direct retrieval of whole archival images, to dynamic extraction of cutouts, to on-demand computation of large image mosaics, with the returned images available in a variety of scientific and graphical output formats. SIAP provides capabilities for both data discovery and data and metadata retrieval.

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